# File lib/eventmachine.rb, line 318
  def self.add_timer *args, &block
    interval = args.shift
    code = args.shift || block
    if code
      # check too many timers!
      s = add_oneshot_timer((interval.to_f * 1000).to_i)
      @timers[s] = code
      s
    end
  end